IGF-1 LR3: Extended Growth Factor Research Guide

IGF-1 LR3 (Insulin-Like Growth Factor-1 Long Arginine 3) is a synthetic modified analog of natural IGF-1 with enhanced properties for research applications. Composition: 83 amino acids (9.1 kDa molecular weight) Key Modifications: - 13 additional amino acids added to N-terminal - Arginine substitution at position 3 (replacing glutamic acid) - These changes prevent binding to IGF-binding proteins (IGFBPs) Extended Half-Life: 20-30 hours (vs. minutes for natural IGF-1) — remains active up to 120× longer than standard IGF-1. - PI3K/Akt/mTOR signaling: Drives protein synthesis and growth - MAPK pathway: Influences cell proliferation and differentiation - Satellite cell activation: Muscle stem cells for repair and new fiber creation Research shows IGF-1 LR3 may affect both: 1. Hyperplasia: Creation of new muscle cells 2. Hypertrophy: Increased size of existing muscle fibers 3. Mitogenesis: Development of new muscle fibers | Area | Observed Effects | |------|------------------| | Muscle Development | Satellite cell proliferation and differentiation | | Recovery | Accelerated tissue repair and regeneration | | Fat Metabolism | Enhanced lipolysis and nutrient partitioning | | Protein Synthesis | Activation of anabolic pathways | | Glucose Metabolism | Enhanced glucose uptake in muscle cells | | Factor | Natural IGF-1 | IGF-1 LR3 | |--------|---------------|-----------| | Half-life | Minutes | 20-30 hours | | IGFBP Binding | High (limits activity) | Low (remains free) | | Bioavailability | Limited | Dramatically enhanced | | Duration of effects | Short | Nearly 24 hours | - Highly potent compound requiring careful dosing protocols - May affect glucose metabolism (hypoglycemia risk in research) - Receptor desensitization possible with continuous use - Often studied in cycles with rest periods - Lyophilized: Stable for 3-4 months at proper temperature - After reconstitution: Must be refrigerated - Typical forms: 1mg vials for research applications Note: This compound is for research purposes only and is not approved for therapeutic use.